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The Twin ideally likes to see a 4 ohm load. But as with most Fender tube amps, from 50% to 200% of ideal is acceptable as long as you don't play at full volume with heavy distortion. So total load on the Twin can be from 2 ohms to 8 ohms.

If you plug an external cabinet into the EXT. SPKR jack (with the internal speaker still connected), the internal and external speakers are connected in parallel. The internal speaker is *not* turned off. So the external speaker should ideally be 4 ohms. That will give a 2 ohm total load and the volume coming out of the internal and external speakers will be approximately equal.

You can use a larger than 4 ohm external speaker (e.g., 8 ohms), but then the volume of the internal and external speakers will be imbalanced.

@lawsofphysics: Thanks. In my case I'm a bit afraid to connect a Hammond organ with its deep 32Hz bass to the Twins internal speakers. The player would like to have a bass boost for the organ. I guess the player will not use more than 50 watts (for the room situation), and the external speaker box is a JBL equipped with two D140 F in parallel, each having 16 Ohms (yes) giving a total of 8 Ohms.

Can the internal speakers be taken off easily? Isn't the a 1/4" plug coming from the internal speakers? I'm not with the amp at the moment but will be there later today.

Guitar speakers are not designed to handle the very large cone movement (xmax) required for low bass notes. They can easily be damaged.

So if you want to use the Twin for low bass notes, you should disconnect the internal speakers by pulling the plug at the INT. SPKR. jack. Then plug in a true bass speaker at that same jack. Don't use the EXT. SPKR. jack.

And never operate the amp with no speaker connected, that can easily damage the output transformer.

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